Paste this code into your developer tools when looking at github contributions. Click the cells you want to highlight.

Hack Github Contributions

$('rect').click(function(e) {
  var target = e.target,
      $target = $(target);
  if (target.count === undefined || target.count === 5) {
    target.count = 0;
  }
  
  if (target.count === 0) {
    $target.attr('fill', '#eeeeee');
  } else if (target.count === 1) {
    $target.attr('fill', '#d6e685');
  } else if (target.count === 2) {
    $target.attr('fill', '#8cc665');
  } else if (target.count === 3) {
    $target.attr('fill', '#44a340');
  } else if (target.count === 4) {
    $target.attr('fill', '#1e6823');
  }
  target.count++;
});